Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f53c91e6701909…

MALICIOUS

PDF

45.3 KB Created: 2021-06-09 13:22:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0ef878c92d28752fdb8c4d1fabe8304d SHA-1: 5b2b3e14ea63e792d7f82020a3045a7e2a7d45bf SHA-256: 54f53c91e67019094fb3629699fab6ea9af1217b63916e315aa3267baa5dd35b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures for free Robux and game hacks, directing users to a known malicious redirector. The embedded URL, https://netcdn.tw/app/431946152/free-robux-no-survey-or-download-2021-game-hack, is associated with malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and heuristics indicate a phishing or scam attempt designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.tw/app/431946152/free-robux-no-survey-or-download-2021-game-hack In PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-robux-no-survey-no-download-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-do-you-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/get-free-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/freespinandcoin_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-roblox-clothes-templates_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-ids-for-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/can-i-have-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F63 25408 bytes
SHA-256: 1fdc4fee7f10d5b1347f1099350a3d3ed071c55f6320dde4975cd77cd8b64819
font_01_sfnt_off00008a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A87 19516 bytes
SHA-256: 45710b584ad67eeeff296c4636ea55851b4e523a5d54510a935be6097c8370bd